Miracool Bandanas - Khaki When heat stress takes its toll on workers it not only affects their overall productivity, it affects their overall safety as well. This bandana incorporates MiraCool crystals which are securely encased inside the bandana. The crystals can hold up to 1000 times their weight in cool refreshing water. Simply soak in cold water for 10-20 minutes and these neck/body refreshing items will provide relief from the heat. Dimensions: 2" wide x 32" long but the crystal area measures 16 3/4 inches long.